arm64: defconfig: Enable PF8x00 as builtin

This driver is mandatory for the nitrogen8m mini board
when booting from the sdcard slot.
Signed-off-by: Adrien Grassein <adrien.grassein@gmail.com>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>

arch/arm64/configs/defconfig

@@ -607,6 +607,7 @@ CONFIG_REGULATOR_HI655X=y
 CONFIG_REGULATOR_MAX77620=y
 CONFIG_REGULATOR_MAX8973=y
 CONFIG_REGULATOR_PCA9450=y
+CONFIG_REGULATOR_PF8X00=y
 CONFIG_REGULATOR_PFUZE100=y
 CONFIG_REGULATOR_PWM=y
 CONFIG_REGULATOR_QCOM_RPMH=y