soc/amd/common/include/gpio_defs.h: Add comment for accuracy

The GPIO debounce timebase bit 4 is only 183uS on Picasso. On the other
SoCs it is 244uS. This affects the 1mS and 2mS actual debounce times
slightly.

Time  PCO      Others
1mS   0.915mS  1.220mS
2mS   2.013mS  2.684mS

Signed-off-by: Fred Reitberger <reitbergerfred@gmail.com>
Change-Id: Id84bef75e6ab134778721ca269d763a4bb2ddde5
Reviewed-on: https://review.coreboot.org/c/coreboot/+/69209
Reviewed-by: Felix Held <felix-coreboot@felixheld.de>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

0 files changed, 0 insertions, 0 deletions