sparc: fix unknown escape sequence warnings

I don't know what exactly the code was going for, but the object code
is the same before/after my change, and in looking at the env strings,
this seems to be OK.

Otherwise gcc warns:
cc1: warning: unknown escape sequence: '\$'
cc1: warning: unknown escape sequence: '\)'
cc1: warning: unknown escape sequence: '\040'
cc1: warning: unknown escape sequence: '\$'
cc1: warning: unknown escape sequence: '\)'

Signed-off-by: Mike Frysinger <vapier@gentoo.org>
diff --git a/include/configs/grsim_leon2.h b/include/configs/grsim_leon2.h
index 88d2aad..fb9a3f9 100644
--- a/include/configs/grsim_leon2.h
+++ b/include/configs/grsim_leon2.h
@@ -110,7 +110,7 @@
 	"net_nfs=tftp 40000000 ${bootfile};run nfsargs addip;bootm\0"	\
 	"rootpath=/export/roofs\0"					\
 	"scratch=40000000\0"					\
-	"getkernel=tftpboot \$\(scratch\)\ \$\(bootfile\)\0" \
+	"getkernel=tftpboot $(scratch) $(bootfile)\0" \
 	"ethaddr=00:00:7A:CC:00:12\0" \
 	"bootargs=console=ttyS0,38400" \
 	""