dumpstate: dump display PMIC registers Dump PMIC registers for display power supplies. Bug: 146400230 Test: took a bugreport in userdebug build, saw display register dumps: ------ ELVDD Register Dump (/sys/kernel/debug/regmap/spmi0-05/data) ------ de00: 00 de01: 01 de02: 01 ... Change-Id: I9d9e0c74af9e10d4bdaf0151b97ed382d269021e