drm/amd: Beef up ACP Kconfig menu text

The current "text" needs a user to use a crystal ball in order to find
out what this ACP thing is.

Use the text from

  a8fe58ce ("drm/amd: add ACP driver support")

to make it a bit more understandable to the rest of the world.
Signed-off-by: Borislav Petkov <bp@suse.de>
Cc: Alex Deucher <alexander.deucher@amd.com>
Cc: Chunming Zhou <david1.zhou@amd.com>
Cc: Jammy Zhou <Jammy.Zhou@amd.com>
Cc: Maruthi Bayyavarapu <maruthi.bayyavarapu@amd.com>
Cc: Murali Krishna Vemuri <murali-krishna.vemuri@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/acp/Kconfig

-menu "ACP Configuration"
+menu "ACP (Audio CoProcessor) Configuration"
 
 config DRM_AMD_ACP
-       bool "Enable ACP IP support"
+       bool "Enable AMD Audio CoProcessor IP support"
        select MFD_CORE
        select PM_GENERIC_DOMAINS if PM
        help
 	Choose this option to enable ACP IP support for AMD SOCs.
+	This adds the ACP (Audio CoProcessor) IP driver and wires
+	it up into the amdgpu driver.  The ACP block provides the DMA
+	engine for the i2s-based ALSA driver. It is required for audio
+	on APUs which utilize an i2s codec.
 
 endmenu