linux-user: rename cpu-uname -> uname

To move more uname related functions out of syscall.c,
rename cpu-uname.{c,h} to uname.{c.h}

Signed-off-by: Riku Voipio <riku.voipio@linaro.org>
diff --git a/linux-user/Makefile.objs b/linux-user/Makefile.objs
index 5899d72..fd50217 100644
--- a/linux-user/Makefile.objs
+++ b/linux-user/Makefile.objs
@@ -1,5 +1,5 @@
 obj-y = main.o syscall.o strace.o mmap.o signal.o \
-	elfload.o linuxload.o uaccess.o cpu-uname.o
+	elfload.o linuxload.o uaccess.o uname.o
 
 obj-$(TARGET_HAS_BFLT) += flatload.o
 obj-$(TARGET_I386) += vm86.o