Add support for MyMakers RP2350B board #3041

Job	Run time
Spelling, Style, Boards, Package, PIO	15s
Build 5	6m 14s
Build 1	7m 16s
Build 3	8m 16s
Build 4	7m 25s
Build 2	8m 38s
Build 0	6m 23s
Build RP2350-RISCV 2	7m 8s
Build RP2350 5	5m 56s
Build RP2350-RISCV 5	5m 45s
Build RP2350-RISCV 1	6m 1s
Build RP2350 3	7m 22s
Build RP2350 0	6m 11s
Build PlatformIO Examples	3m 52s
Build RP2350-RISCV 0	5m 27s
Build RP2350 2	7m 4s
Build RP2350-RISCV 4	6m 43s
Build RP2350 1	5m 56s
Build RP2350 4	7m 3s
Build RP2350-RISCV 3	7m 31s
Build Every Variant 3	6m 36s
Mac (macOS-13)	3m 4s
Build Every Variant 0	6m 53s
Build TinyUSB Examples	4m 10s
Build Every Variant 2	6m 53s
Mac (macOS-14)	3m 8s
Windows	3m 37s
Build Every Variant 1	6m 46s
	2h 47m 33s

Provide feedback