Revert "linux: arc: disable kernel unwinding to fix modules loading"

This reverts commit acd41539d6.

There's a fix in upstream that will at some point land in 4.4 stable as
well so we'll get rid of this hack and with the next commit will apply
upstream fix.

Signed-off-by: Alexey Brodkin <abrodkin@synopsys.com>

target/linux/arc770/config-4.4

@@ -18,7 +18,7 @@ CONFIG_ARC_CURR_IN_REG=y
 CONFIG_ARC_DBG=y
 # CONFIG_ARC_DBG_TLB_MISS_COUNT is not set
 # CONFIG_ARC_DBG_TLB_PARANOIA is not set
-# CONFIG_ARC_DW2_UNWIND is not set
+CONFIG_ARC_DW2_UNWIND=y
 CONFIG_ARC_EMUL_UNALIGNED=y
 # CONFIG_ARC_FPU_SAVE_RESTORE is not set
 CONFIG_ARC_HAS_DCACHE=y
@@ -78,6 +78,7 @@ CONFIG_HAVE_FUTEX_CMPXCHG=y
 CONFIG_HAVE_IOREMAP_PROT=y
 CONFIG_HAVE_LATENCYTOP_SUPPORT=y
 CONFIG_HAVE_MEMBLOCK=y
+CONFIG_HAVE_MOD_ARCH_SPECIFIC=y
 CONFIG_HAVE_NET_DSA=y
 CONFIG_HAVE_OPROFILE=y
 CONFIG_HAVE_PERF_EVENTS=y

target/linux/archs38/config-4.4

@@ -15,7 +15,7 @@ CONFIG_ARC_CURR_IN_REG=y
 CONFIG_ARC_DBG=y
 # CONFIG_ARC_DBG_TLB_MISS_COUNT is not set
 # CONFIG_ARC_DBG_TLB_PARANOIA is not set
-# CONFIG_ARC_DW2_UNWIND is not set
+CONFIG_ARC_DW2_UNWIND=y
 CONFIG_ARC_HAS_COH_CACHES=y
 CONFIG_ARC_HAS_DCACHE=y
 # CONFIG_ARC_HAS_DCCM is not set
@@ -85,6 +85,7 @@ CONFIG_HAVE_FUTEX_CMPXCHG=y
 CONFIG_HAVE_IOREMAP_PROT=y
 CONFIG_HAVE_LATENCYTOP_SUPPORT=y
 CONFIG_HAVE_MEMBLOCK=y
+CONFIG_HAVE_MOD_ARCH_SPECIFIC=y
 CONFIG_HAVE_NET_DSA=y
 CONFIG_HAVE_OPROFILE=y
 CONFIG_HAVE_PERF_EVENTS=y
@@ -174,6 +175,7 @@ CONFIG_SRCU=y
 CONFIG_STACKTRACE=y
 CONFIG_STMMAC_ETH=y
 CONFIG_STMMAC_PLATFORM=y
+# CONFIG_SUNXI_SRAM is not set
 CONFIG_TICK_CPU_ACCOUNTING=y
 CONFIG_UNINLINE_SPIN_UNLOCK=y
 CONFIG_USB_SUPPORT=y