ARM: shmobile: defconfig: Refresh for v6.13-rc1

Refresh the defconfig for Renesas ARM systems:
  - Enable RZ DMA Controller support, as used on the Genmai and RSK+RZA1
    development boards.

Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Link: https://lore.kernel.org/b8727e642508433016290a998c880b54de2e208d.1733320866.git.geert+renesas@glider.be

Author: geertu

arch/arm/configs/shmobile_defconfig

@@ -192,6 +192,7 @@ CONFIG_DW_DMAC=y
 CONFIG_RZN1_DMAMUX=y
 CONFIG_RCAR_DMAC=y
 CONFIG_RENESAS_USB_DMAC=y
+CONFIG_RZ_DMAC=y
 # CONFIG_IOMMU_SUPPORT is not set
 CONFIG_ARCH_EMEV2=y
 CONFIG_ARCH_R8A7794=y