toolchain: gcc bug 90620 has not been fixed in gcc 8.x

gcc bug 90620 appears with gcc 8.x so remove the version check
dependency and keep only the BR2_microblaze one.

Signed-off-by: Giulio Benetti <giulio.benetti@micronovasrl.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>

toolchain/Config.in

@@ -154,11 +154,10 @@ config BR2_TOOLCHAIN_HAS_GCC_BUG_85862
 
 # https://gcc.gnu.org/bugzilla/show_bug.cgi?id=90620
 # ICE: in do_output_reload, at reload1.c:7978 on microblaze.
-# It's been fixed on Gcc 8.x but reappeared on Gcc 9.x
+# It's still not fixed in gcc 9.x
 config BR2_TOOLCHAIN_HAS_GCC_BUG_90620
 	bool
 	default y if BR2_microblaze
-	depends on !BR2_TOOLCHAIN_GCC_AT_LEAST_8 || BR2_TOOLCHAIN_GCC_AT_LEAST_9
 
 config BR2_TOOLCHAIN_HAS_NATIVE_RPC
 	bool