drm/amdgpu: fix kernel-doc warnings on non-kernel-doc comments

Don't use "begin kernel-doc notation" (/**) for comments that are
not kernel-doc. This eliminates warnings reported by the 0day bot.

drivers/gpu/drm/amd/amdgpu/gfx_v9_4_2.c:89: warning: This comment starts with '/**', but isn't a kernel-doc comment. Refer Documentation/doc-guide/kernel-doc.rst
    * This shader is used to clear VGPRS and LDS, and also write the input
drivers/gpu/drm/amd/amdgpu/gfx_v9_4_2.c:209: warning: This comment starts with '/**', but isn't a kernel-doc comment. Refer Documentation/doc-guide/kernel-doc.rst
    * The below shaders are used to clear SGPRS, and also write the input
drivers/gpu/drm/amd/amdgpu/gfx_v9_4_2.c:301: warning: This comment starts with '/**', but isn't a kernel-doc comment. Refer Documentation/doc-guide/kernel-doc.rst
    * This shader is used to clear the uninitiated sgprs after the above

Fixes: 0e0036c7 ("drm/amdgpu: fix no full coverage issue for gprs initialization")
Signed-off-by: Randy Dunlap <rdunlap@infradead.org>
Reported-by: kernel test robot <lkp@intel.com>
Cc: Alex Deucher <alexander.deucher@amd.com>
Cc: Christian König <christian.koenig@amd.com>
Cc: "Pan, Xinhui" <Xinhui.Pan@amd.com>
Cc: Dennis Li <Dennis.Li@amd.com>
Cc: amd-gfx@lists.freedesktop.org
Cc: dri-devel@lists.freedesktop.org
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/amdgpu/gfx_v9_4_2.c

@@ -85,7 +85,7 @@ static const struct soc15_reg_golden golden_settings_gc_9_4_2_alde[] = {
 	SOC15_REG_GOLDEN_VALUE(GC, 0, regTCI_CNTL_3, 0xff, 0x20),
 };
 
-/**
+/*
  * This shader is used to clear VGPRS and LDS, and also write the input
  * pattern into the write back buffer, which will be used by driver to
  * check whether all SIMDs have been covered.
@@ -206,7 +206,7 @@ const struct soc15_reg_entry vgpr_init_regs_aldebaran[] = {
 	{ SOC15_REG_ENTRY(GC, 0, regCOMPUTE_STATIC_THREAD_MGMT_SE7), 0xffffffff },
 };
 
-/**
+/*
  * The below shaders are used to clear SGPRS, and also write the input
  * pattern into the write back buffer. The first two dispatch should be
  * scheduled simultaneously which make sure that all SGPRS could be
@@ -302,7 +302,7 @@ const struct soc15_reg_entry sgpr96_init_regs_aldebaran[] = {
 	{ SOC15_REG_ENTRY(GC, 0, regCOMPUTE_STATIC_THREAD_MGMT_SE7), 0xffffffff },
 };
 
-/**
+/*
  * This shader is used to clear the uninitiated sgprs after the above
  * two dispatches, because of hardware feature, dispath 0 couldn't clear
  * top hole sgprs. Therefore need 4 waves per SIMD to cover these sgprs