Revert "blktrace: disable on PowerPC"

This reverts commit 0d8158fc619ce849b531d07b27da4ba9748d4ea4. Thanks to
a fix in libaio, blktrace now builds fine on PowerPC, so there's no
reason to disable it anymore.

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>

package/blktrace/Config.in

@@ -3,8 +3,6 @@ config BR2_PACKAGE_BLKTRACE
 	# Uses posix_spawn()
 	depends on BR2_TOOLCHAIN_USES_GLIBC || BR2_TOOLCHAIN_USES_MUSL
 	depends on BR2_PACKAGE_LIBAIO_ARCH_SUPPORTS
-	# issue: hidden symbol `_rest32gpr_30_x` is referenced by DSO
-	depends on !BR2_powerpc
 	select BR2_PACKAGE_LIBAIO
 	help
 	  blktrace is a block layer IO tracing mechanism which provides
@@ -15,5 +13,4 @@ config BR2_PACKAGE_BLKTRACE
 
 comment "blktrace needs a glibc or musl toolchain"
 	depends on BR2_PACKAGE_LIBAIO_ARCH_SUPPORTS
-	depends on !BR2_powerpc
 	depends on !(BR2_TOOLCHAIN_USES_GLIBC || BR2_TOOLCHAIN_USES_MUSL)