Fix armv7 autodetection

armv7l is armv7 architecture and CFG_CPUTYPE should be armv7 in order to end up
with armv7-unknown-linux-gnueabihf.mk rather than
arm-unknown-linux-gnueabihf.mk

Author: matwey

configure

@@ -508,7 +508,7 @@ case $CFG_CPUTYPE in
         ;;
 
     armv7l)
-        CFG_CPUTYPE=arm
+        CFG_CPUTYPE=armv7
         CFG_OSTYPE="${CFG_OSTYPE}eabihf"
         ;;