remove HAL_MODULE_INFO_SYM const

HAL_MODULE_INFO_SYM was declared as read-only, but
the struct is written to by libhardware.  This causes
a segfault when -Wl,-z,relro is enabled.

Fixed.

Change-Id: Ied24f54a294ea705b06754a419823d595e3def62
diff --git a/loc_api/libloc_api/gps.c b/loc_api/libloc_api/gps.c
index ec6fbd0..a28a608 100644
--- a/loc_api/libloc_api/gps.c
+++ b/loc_api/libloc_api/gps.c
@@ -55,7 +55,7 @@
     .open = open_gps
 };
 
-const struct hw_module_t HAL_MODULE_INFO_SYM = {
+struct hw_module_t HAL_MODULE_INFO_SYM = {
     .tag = HARDWARE_MODULE_TAG,
     .version_major = 1,
     .version_minor = 0,