configs/ti_am62ax_sk_defconfig: Fix kernel configuration

The k3-am62a7-sk.dts describes an I2C PMIC TPS659312 which features a
number of regulators. One of them, ldo1, is used as power supply for the
SD card host controller regulator. When the rootfs is on the SD
card (like with this configuration), we need support for these three
components (Regulator driver, I2C PMIC glue and PMIC MFD driver) to be
built-in in order to avoid boot failures.

Tested on an AM62A LP SK.

Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>
Reviewed-by: Bryan Brattlof <bb@ti.com>
Signed-off-by: Romain Naour <romain.naour@smile.fr>
(cherry picked from commit 8ba6459ac1413afa72124bc6387a4f3ac4306914)
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

board/ti/am62ax-sk/linux.config

@@ -0,0 +1,3 @@
+CONFIG_MFD_TPS6594=y
+CONFIG_MFD_TPS6594_I2C=y
+CONFIG_REGULATOR_TPS6594=y

configs/ti_am62ax_sk_defconfig

@@ -10,6 +10,7 @@ BR2_LINUX_KERNEL=y
 BR2_LINUX_KERNEL_CUSTOM_VERSION=y
 BR2_LINUX_KERNEL_CUSTOM_VERSION_VALUE="6.10"
 BR2_LINUX_KERNEL_USE_ARCH_DEFAULT_CONFIG=y
+BR2_LINUX_KERNEL_CONFIG_FRAGMENT_FILES="board/ti/am62ax-sk/linux.config"
 BR2_LINUX_KERNEL_DTS_SUPPORT=y
 BR2_LINUX_KERNEL_INTREE_DTS_NAME="ti/k3-am62a7-sk"
 BR2_TARGET_ROOTFS_EXT2=y