redhat/configs: enable some regulators for RHEL
Enable the regulators below for aarch64 for RHEL, note that they're already enabled for Fedora:
- REGULATOR_ARM_SCMI
- REGULATOR_PCA9450
- REGULATOR_PF8X00
- REGULATOR_PWM
Signed-off-by: Luiz Capitulino luizcap@redhat.com