arch/arm/src/samd5e5: Completes GCLK configuration logic. Still FDPLL and FDLL support.
arch/arm/src/samd5e5: A little more GCLK configuratino logic. Still incomplete.
arch/arm/src/smad5e5: Beginning of GCLK configuration logic.
arch/arm/src/samd5e5: Add MCLK configuration logic.
arch/arm/src/samd5e5: Add XOSC0/1 configuration logic.
arch/arm/src/samd5e5: Add XOSC32 configuration logic.
arch/arm/src/samd5e5: Rip out all of the leveraged clock configuration logic and start from scratch.