ARM: renesas: Add R8A779G0 V4H White Hawk board code

Add board code for R8A779G0 V4H White Hawk board.

Reviewed-by: Marek Vasut <marek.vasut+renesas@mailbox.org>
Signed-off-by: Hai Pham <hai.pham.ud@renesas.com>
Signed-off-by: Marek Vasut <marek.vasut+renesas@mailbox.org>
[Marek: Synchronize configuration symbols which are now switched to Kconfig
        Mallocate gd->bd->bi_boot_params, i.e. drop the assignment
        Sort headers, use clrbits_le32(), use BIT macros where appropriate
        Use CONFIG_SYS_CLK_FREQ for counter frequency instead of custom macro]