verdin-imx8mp: various config additions and improvements

- enable bootcount command
- enable CRC32 and MD5
- enable time commands
- enable GPIO LED support
- enable further eMMC HS400 functionality
- enable fixed PHY and MDIO driver model
- enable USB host functionality
- enable thermal management unit driver
- enable hexdump

Signed-off-by: Marcel Ziswiler <marcel.ziswiler@toradex.com>