gallium/util: Remove the EMBEDDED_DEVICE macro because nobody use it

Closes: https://gitlab.freedesktop.org/mesa/mesa/-/issues/7641

Signed-off-by: Yonggang Luo <luoyonggang@gmail.com>
Acked-by: Jose Fonseca <jfonseca@vmware.com>
Acked-by: Roland Scheidegger <sroland@vmware.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/19552>

src/util/os_misc.c

@@ -201,8 +201,6 @@ os_get_android_option(const char *name)
 }
 #endif
 
-
-#if !defined(EMBEDDED_DEVICE)
 const char *
 os_get_option(const char *name)
 {
@@ -214,7 +212,6 @@ os_get_option(const char *name)
 #endif
    return opt;
 }
-#endif /* !EMBEDDED_DEVICE */
 
 /**
  * Return the size of the total physical memory.