ARM: configs: at91: add MCP16502 PMIC driver

Add MCP16502 PMIC driver CONFIG_REGULATOR_MCP16502 which is needed
to supply required voltage levels.

Signed-off-by: Durai Manickam KR <durai.manickamkr@microchip.com>

Author: duraikvddp

arch/arm/configs/at91_dt_defconfig

@@ -182,6 +182,7 @@ CONFIG_MFD_ATMEL_FLEXCOM=y
 CONFIG_MFD_ATMEL_HLCDC=y
 CONFIG_REGULATOR=y
 CONFIG_REGULATOR_FIXED_VOLTAGE=y
+CONFIG_REGULATOR_MCP16502=y
 CONFIG_MEDIA_SUPPORT=y
 CONFIG_MEDIA_SUPPORT_FILTER=y
 # CONFIG_MEDIA_SUBDRV_AUTOSELECT is not set