dts: arm: renesas: Add support Flash LP for Renesas RA4, RA2

Add dts node to support Flash LP for:
- RA4: RA4M1, RA4W1
- RA2: RA2A1, RA2L1

Signed-off-by: Khoa Nguyen <khoa.nguyen.xh@renesas.com>
10 files changed