meta-quanta: gbs: add xml for igps and patch/dts for u-boot

1.XML:
  change the SPI speed to 19Mhz

2.U-boot:
  dts/pinctrl: add GBS dts/pinctrl support

Nuvoton u-boot srcrev bump adb4ac1af3...6870e66f6b:
https://gerrit.openbmc-project.xyz/c/openbmc/meta-nuvoton/+/34756

3.modify u-boot environment partiions offset for GBS

Signed-off-by: George Hung <george.hung@quantatw.com>
Change-Id: I87fbd7d65c2d1c002bdbb9242182e40c91c4ccbe
6 files changed