ARM: shmobile: defconfig: Refresh for v6.16-rc2

Refresh the defconfig for Renesas ARM systems:
  - Disable CONFIG_DWMAC_RENESAS_GBETH, which defaults to yes since
    commit 461f652 ("net: stmmac: Add DWMAC glue layer for
    Renesas GBETH"), but is only used on Renesas ARM64 SoCs.

Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Link: https://lore.kernel.org/f04a2b0e2c9128b4fa644850270b55493358be39.1750074375.git.geert+renesas@glider.be

Author: geertu

arch/arm/configs/shmobile_defconfig

@@ -58,6 +58,7 @@ CONFIG_SH_ETH=y
 CONFIG_RAVB=y
 CONFIG_SMSC911X=y
 CONFIG_STMMAC_ETH=y
+# CONFIG_DWMAC_RENESAS_GBETH is not set
 CONFIG_MICREL_PHY=y
 CONFIG_SMSC_PHY=y
 CONFIG_CAN_RCAR=y