mvebu: tune kernel config for performance

Signed-off-by: Felix Fietkau <nbd@nbd.name>

target/linux/mvebu/config-4.4

@@ -48,6 +48,7 @@ CONFIG_ARM_MVEBU_V7_CPUIDLE=y
 CONFIG_ARM_PATCH_PHYS_VIRT=y
 CONFIG_ARM_THUMB=y
 # CONFIG_ARM_THUMBEE is not set
+CONFIG_ARM_UNWIND=y
 CONFIG_ARM_VIRT_EXT=y
 CONFIG_ASYNC_TX_ENABLE_CHANNEL_SWITCH=y
 CONFIG_ATA=y
@@ -131,7 +132,6 @@ CONFIG_EDAC_ATOMIC_SCRUB=y
 CONFIG_EDAC_SUPPORT=y
 CONFIG_FIXED_PHY=y
 CONFIG_FIX_EARLYCON_MEM=y
-CONFIG_FRAME_POINTER=y
 CONFIG_GENERIC_ALLOCATOR=y
 CONFIG_GENERIC_BUG=y
 CONFIG_GENERIC_CLOCKEVENTS=y