arm64: dts: mt2712-evb: Fix vproc fixed regulators unit names

arm64: dts: mt2712-evb: Fix vproc fixed regulators unit names

[ Upstream commit a3c6da2155b44ff3987f8aad1cababddab39856c ]

Update the names to regulator-vproc-buck{0,1} to fix unit_addres_vs_reg
warnings for those.

Fixes: 8ec19a50c9b3 ("arm64: dts: mediatek: add mt2712 cpufreq related device nodes")
Signed-off-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
Link: https://lore.kernel.org/r/20221013152212.416661-6-angelogioacchino.delregno@collabora.com
Signed-off-by: Matthias Brugger <matthias.bgg@gmail.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>