pci: pcie-rcar-gen4: Fix PHY initialization

pci: pcie-rcar-gen4: Fix PHY initialization

R-Car V4H Reference Manual R19UH0186EJ0130 Rev.1.30 Apr. 21, 2025
page 4581 Figure 104.3b Initial Setting of PCIEC(example) middle
of the figure indicates that fourth write into register 0x148 [2:0]
is 0x3 or GENMASK(1, 0). The current code writes GENMASK(11, 0)
which is a typo. Fix the typo.

Fixes: be3dd0dc2fd9 ("pci: pcie-rcar-gen4: Add Renesas R-Car Gen4 DW PCIe controller driver")
Signed-off-by: Marek Vasut <marek.vasut+renesas@mailbox.org>