drivers: flash: Add Infineon CAT1 Flash driver

- Added initial version of Infineon CAT1 Flash driver
- Added binding file for infineon,cat1-flash-controller.yaml
- Added overlays for subsys/nvs and drivers/flash_shell
to support cy8cproto_063_ble, cy8cproto_062_4343w boards
- Defined erase-block-size in PSoC6 MPN dtsi.

Signed-off-by: Sreeram Tatapudi <sreeram.praveen@infineon.com>