exo2: implement the rest of cpu suspend (security checks TODO)

libraries/libexosphere/include/exosphere/tegra/tegra_pmc.hpp

@@ -185,6 +185,8 @@ DEFINE_PMC_REG_BIT_ENUM(PWRGATE_STATUS_AUD,   27, OFF, ON);
 DEFINE_PMC_REG_BIT_ENUM(PWRGATE_STATUS_DFD,   28, OFF, ON);
 DEFINE_PMC_REG_BIT_ENUM(PWRGATE_STATUS_VE2,   29, OFF, ON);
 
+DEFINE_PMC_REG(PWRGATE_STATUS_CE123, 9, 3);
+
 DEFINE_PMC_REG(SET_SW_CLAMP_CRAIL, 0, 1);
 
 DEFINE_PMC_REG_TWO_BIT_ENUM(IO_DPD_REQ_CODE, 30, IDLE, DPD_OFF, DPD_ON, RESERVED3);