lpc: Add lpcxpresso54114 board based on its architecture

Add default drivers, pinmux configurations, and other board level
configuration parameters in respective Kconfigs.

Add board dts, fixup, and docs.

Samples tested include:
- hello_world
- sychronization
- basic/blinky
- basic/threads

Signed-off-by: Shiksha Patel <shiksha.patel@nxp.com>
Signed-off-by: Maureen Helm <maureen.helm@nxp.com>