BugLink: https://bugs.launchpad.net/bugs/1864773

[ Upstream commit 9540cbdf ]

The Port C I/O Register 0 contains 7 reserved bits, but the descriptor
contains only dummy configuration values for 6 reserved bits, thus
breaking the configuration of all subsequent fields in the register.

Fix this by adding the two missing configuration values.

Fixes: f5e811f2 ("sh-pfc: Add sh7269 pinmux support")
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Reviewed-by: Simon Horman <horms+renesas@verge.net.au>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Signed-off-by: Khalid Elmously <khalid.elmously@canonical.com>
Signed-off-by: Kleber Sacilotto de Souza <kleber.souza@canonical.com>