MIPS: JZ4750D: Add definitions for gpio-keys and matrix-keypad for rzx50
MIPS: JZ4750D: jz_power_off() calls jz_pm_hibernate() now; this should fix poweroff command
jzchar: JZ4750D: Cleanup jz_sadc.c driver

  - Remove all touchscreen panel code and jz_ts.h
  - Do not call run_sbin_poweroff() from poweroff.c if
    CONFIG_JZ_POWEROFF is not defined
jzchar: JZ4750D: Cleanup drivers, fix formatting
MIPS: JZ4750D: Cleanup pm.c - remove redundant code
MIPS: JZ4750D: remove ingenic-style GPIO interrupt code from irq.c; it is handled in gpio.c
MIPS: JZ4750D: Add definition for A380 gpio keys