arm64: defconfig: Enable TI LP873X PMIC

Enable the TI LP873X PMIC configs for the PHYTEC am642-phyboard-electra
board.
Signed-off-by: Nathan Morrisson <nmorrisson@phytec.com>
Link: https://lore.kernel.org/r/20240606234145.3311068-1-nmorrisson@phytec.comSigned-off-by: Vignesh Raghavendra <vigneshr@ti.com>

arch/arm64/configs/defconfig

@@ -747,6 +747,7 @@ CONFIG_MFD_SEC_CORE=y
 CONFIG_MFD_SL28CPLD=y
 CONFIG_RZ_MTU3=y
 CONFIG_MFD_TI_AM335X_TSCADC=m
+CONFIG_MFD_TI_LP873X=m
 CONFIG_MFD_TPS65219=y
 CONFIG_MFD_TPS6594_I2C=m
 CONFIG_MFD_ROHM_BD718XX=y
@@ -762,6 +763,7 @@ CONFIG_REGULATOR_FAN53555=y
 CONFIG_REGULATOR_GPIO=y
 CONFIG_REGULATOR_HI6421V530=y
 CONFIG_REGULATOR_HI655X=y
+CONFIG_REGULATOR_LP873X=m
 CONFIG_REGULATOR_MAX77620=y
 CONFIG_REGULATOR_MAX8973=y
 CONFIG_REGULATOR_MAX20411=m