arm64: defconfig: Add Renesas 9-series PCIe clock generator

MBa8MPxL (with TQMa8MPQL attached) needs this driver for PCIe reference
clock generation. Add it do default config.
Signed-off-by: Alexander Stein <alexander.stein@ew.tq-group.com>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>

arch/arm64/configs/defconfig

@@ -1049,6 +1049,7 @@ CONFIG_COMMON_CLK_CS2000_CP=y
 CONFIG_COMMON_CLK_FSL_SAI=y
 CONFIG_COMMON_CLK_S2MPS11=y
 CONFIG_COMMON_CLK_PWM=y
+CONFIG_COMMON_CLK_RS9_PCIE=y
 CONFIG_COMMON_CLK_VC5=y
 CONFIG_COMMON_CLK_NPCM8XX=y
 CONFIG_COMMON_CLK_BD718XX=m