defconfig: sdmshrike: Enable RPMh-regulator driver

Enable the RPMh-regulator driver so that the RPMh-controlled PMIC
regulators on SDMSHRIKE may be controlled by their consumers.

CRs-Fixed: 2209683
Change-Id: I2df70bd5c4c9aceace925bc6c6c8300a172f163f
Signed-off-by: Guru Das Srinagesh <gurus@codeaurora.org>