rcar_gen3: drivers: pfc: H3: Drop pfc_reg_write() forward declaration

There's no point in having forward declaration just before the function
itself, drop it. No functional change.

Signed-off-by: Marek Vasut <marek.vasut+renesas@gmail.com>
Change-Id: I56125389fa6fe3ae169cacdb0e4b60376f0a6489
2 files changed