soc/tegra: pmc: Select REGMAP

Commit 9d5e7c3e ("soc/tegra: pmc: Provide USB sleepwalk register
map") introduced a dependency on the regmap infrastructure, so select
the corresponding Kconfig entry. This avoids failures in random builds
that may otherwise end up having SOC_TEGRA_PMC enabled but not REGMAP.
Signed-off-by: Thierry Reding <treding@nvidia.com>

drivers/soc/tegra/Kconfig

@@ -146,6 +146,7 @@ config SOC_TEGRA_PMC
 	select GENERIC_PINCONF
 	select PM_OPP
 	select PM_GENERIC_DOMAINS
+	select REGMAP
 
 config SOC_TEGRA_POWERGATE_BPMP
 	def_bool y