ARM: dts: Add am335x-pocketbeagle

PocketBeagle is an ultra-tiny-yet-complete open-source USB-key-fob computer.

This board family can be indentified by the A335PBGL in the at24 eeprom:
A2: [aa 55 33 ee 41 33 33 35 50 42 47 4c 30 30 41 32 |.U3.A335PBGL00A2|]

http://beagleboard.org/pocket
https://github.com/beagleboard/pocketbeagle

---
Changes in v3:
- Fix: Board eeprom in subject message. (accidently copied PocketBone)
Changes in v2:
- Use SPDX tags.
- Use eeprom at 50, remove repeated node and fix and remove '_' to fix node_name_chars_strict Warning
- Fix: PocketBeagle Name in Subject (not PocketBeagle Blue)
- Fix: leds remove '_' to fix node_name_chars_strict warning
- Fix: node_name_chars_strict pinmux_*_pins label's.

---
 arch/arm/boot/dts/Makefile                   |   1 +
 arch/arm/boot/dts/am335x-osd335x-common.dtsi | 124 ++++++++++
 arch/arm/boot/dts/am335x-pocketbeagle.dts    | 237 +++++++++++++++++++
 3 files changed, 362 insertions(+)
 create mode 100644 arch/arm/boot/dts/am335x-osd335x-common.dtsi
 create mode 100644 arch/arm/boot/dts/am335x-pocketbeagle.dts

index 7e2424957809..5a09ff15743b 100644
@@ -688,6 +688,7 @@ dtb-$(CONFIG_SOC_AM33XX) += \
 	am335x-pdu001.dtb \
 	am335x-pepper.dtb \
 	am335x-phycore-rdk.dtb \
+	am335x-pocketbeagle.dtb \
 	am335x-shc.dtb \
 	am335x-sbc-t335.dtb \
 	am335x-sl50.dtb \

2.17.0

Thanks applying into omap-for-v4.18/dt.

Tony