i2c: I2C_DESIGNWARE_AMDISP should depend on DRM_AMD_ISP

The AMD Image Signal Processor I2C functionality is only present on AMD
platforms with ISP support, and its platform device is instantiated by
the AMD ISP driver.  Hence add a dependency on DRM_AMD_ISP, to prevent
asking the user about this driver when configuring a kernel that does
not support the AMD ISP.

Fixes: d6263c46 ("i2c: amd-isp: Add ISP i2c-designware driver")
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Reviewed-by: Pratap Nirujogi <pratap.nirujogi@amd.com>
Link: https://lore.kernel.org/r/3888f892b8c4d8c8acd17e56581e726ace7f7092.1746536495.git.geert+renesas@glider.be


Signed-off-by: Andi Shyti <andi.shyti@kernel.org>