mb/google/brya/kinox: Enable NVMe on m.2 socket

KINOX boards have an unpopulated m.2-2280 socket on the board which
can be used for NVMe, but it is non-functional due to GPIO GPP_B2
being set to NC, rather than the baseboard default for M2_SSD_PLA_L.

Drop the override for GPP_B2, so that it uses the baseboard default.

TEST=build/boot kinox with NVMe populated on M.2, verify NVMe drive
detected and bootable.

Change-Id: I8c64953217e8217fc21cd365016e2767d83c8c25
Signed-off-by: Matt DeVillier <matt.devillier@gmail.com>

Author: MrChromebox

src/mainboard/google/brya/variants/kinox/gpio.c

@@ -21,9 +21,6 @@ static const struct pad_config override_gpio_table[] = {
 	/* A22 : DDPC_CTRLDATA ==> NC */
 	PAD_NC(GPP_A22, NONE),
 
-	/* B2  : VRALERT# ==> TP153 */
-	PAD_NC(GPP_B2, NONE),
-
 	/* D0  : ISH_GP0 ==> NC */
 	PAD_NC_LOCK(GPP_D0, NONE, LOCK_CONFIG),
 	/* D1  : ISH_GP1 ==> NC */