defconfig: r4: fix panic_timeout defined twice

Author: frank-w

arch/arm64/configs/mt7988a_bpi-r4_defconfig

@@ -399,7 +399,7 @@ CONFIG_PACKET=y
 CONFIG_PAGE_SIZE_4KB=y
 CONFIG_PANIC_ON_OOPS=y
 CONFIG_PANIC_ON_OOPS_VALUE=1
-CONFIG_PANIC_TIMEOUT=1
+CONFIG_PANIC_TIMEOUT=10
 CONFIG_PARTITION_ADVANCED=y
 CONFIG_PCIE_BUS_DEFAULT=y
 CONFIG_PCI_QUIRKS=y
@@ -1270,5 +1270,3 @@ CONFIG_PCS_MTK_USXGMII=y
 CONFIG_MT7915E=m
 CONFIG_MT798X_WMAC=y
 CONFIG_PHY_MTK_XFI_TPHY=y
-
-CONFIG_PANIC_TIMEOUT=30