util/crossgcc: update to gcc 8.1.0 and binutils 2.30

Also update patches as necessary.

Change-Id: I1e8074954d5d7a4eff590abb7439e9be7d3762aa
Signed-off-by: Patrick Georgi <pgeorgi@chromium.org>
Reviewed-on: https://review.coreboot.org/25997
Reviewed-by: Nico Huber <nico.h@gmx.de>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

util/crossgcc/patches/gcc-8.1.0_armv6s-m.patch

@@ -0,0 +1,64 @@
+Taken from https://gcc.gnu.org/viewcvs/gcc?view=revision&revision=260158
+--- gcc-8-branch/gcc/config/arm/arm-cpus.in	2018/05/11 09:28:10	260157
++++ gcc-8-branch/gcc/config/arm/arm-cpus.in	2018/05/11 09:30:49	260158
+@@ -446,6 +446,8 @@
+  isa ARMv6m
+ end arch armv6-m
+ 
++# This is now equivalent to armv6-m, but we keep it because some
++# versions of GAS still distinguish between the two.
+ begin arch armv6s-m
+  tune for cortex-m1
+  base 6M
+@@ -1168,21 +1170,21 @@
+ begin cpu cortex-m1
+  cname cortexm1
+  tune flags LDSCHED
+- architecture armv6-m
++ architecture armv6s-m
+  costs v6m
+ end cpu cortex-m1
+ 
+ begin cpu cortex-m0
+  cname cortexm0
+  tune flags LDSCHED
+- architecture armv6-m
++ architecture armv6s-m
+  costs v6m
+ end cpu cortex-m0
+ 
+ begin cpu cortex-m0plus
+  cname cortexm0plus
+  tune flags LDSCHED
+- architecture armv6-m
++ architecture armv6s-m
+  costs v6m
+ end cpu cortex-m0plus
+ 
+@@ -1192,7 +1194,7 @@
+  cname cortexm1smallmultiply
+  tune for cortex-m1
+  tune flags LDSCHED SMALLMUL
+- architecture armv6-m
++ architecture armv6s-m
+  costs v6m
+ end cpu cortex-m1.small-multiply
+ 
+@@ -1200,7 +1202,7 @@
+  cname cortexm0smallmultiply
+  tune for cortex-m0
+  tune flags LDSCHED SMALLMUL
+- architecture armv6-m
++ architecture armv6s-m
+  costs v6m
+ end cpu cortex-m0.small-multiply
+ 
+@@ -1208,7 +1210,7 @@
+  cname cortexm0plussmallmultiply
+  tune for cortex-m0plus
+  tune flags LDSCHED SMALLMUL
+- architecture armv6-m
++ architecture armv6s-m
+  costs v6m
+ end cpu cortex-m0plus.small-multiply
+