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: I5ab4ce539be0335b0c86d4cdf34f7c29fa410424
diff --git a/liblight/lights.c b/liblight/lights.c
index 1b54896..bee698a 100755
--- a/liblight/lights.c
+++ b/liblight/lights.c
@@ -118,7 +118,7 @@
 	.open =  open_lights,
 };
 
-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,