drm/amd/amdgpu/amdgpu_ucode: Remove unused function ‘amdgpu_ucode_print_imu_hdr’

Fixes the following W=1 kernel build warning(s):

 drivers/gpu/drm/amd/amdgpu/amdgpu_ucode.c:129:6: warning: no previous prototype for ‘amdgpu_ucode_print_imu_hdr’ [-Wmissing-prototypes]

Cc: Alex Deucher <alexander.deucher@amd.com>
Cc: "Christian König" <christian.koenig@amd.com>
Cc: "Pan, Xinhui" <Xinhui.Pan@amd.com>
Cc: David Airlie <airlied@gmail.com>
Cc: Daniel Vetter <daniel@ffwll.ch>
Cc: amd-gfx@lists.freedesktop.org
Cc: dri-devel@lists.freedesktop.org
Signed-off-by: Lee Jones <lee@kernel.org>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

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

@@ -126,19 +126,6 @@ void amdgpu_ucode_print_gfx_hdr(const struct common_firmware_header *hdr)
 	}
 }
 
-void amdgpu_ucode_print_imu_hdr(const struct common_firmware_header *hdr)
-{
-	uint16_t version_major = le16_to_cpu(hdr->header_version_major);
-	uint16_t version_minor = le16_to_cpu(hdr->header_version_minor);
-
-	DRM_DEBUG("IMU\n");
-	amdgpu_ucode_print_common_hdr(hdr);
-
-	if (version_major != 1) {
-		DRM_ERROR("Unknown GFX ucode version: %u.%u\n", version_major, version_minor);
-	}
-}
-
 void amdgpu_ucode_print_rlc_hdr(const struct common_firmware_header *hdr)
 {
 	uint16_t version_major = le16_to_cpu(hdr->header_version_major);