configs: ti: armv7_common: enable Thumb mode for all

Commit bd2c4522c2 ("ti: armv7: enable EXT support in SPL (using
ti_armv7_common.h)") enabled thumb mode only for SPL builds, however,
All TI armv7 platforms do support thumb, and there is no reason why the
space savings cannot be exploited for u-boot as well.

Reported-by: Murali Karicheri <m-karicheri2@ti.com>
Suggested-by: Tom Rini <trini@konsulko.com>
Signed-off-by: Nishanth Menon <nm@ti.com>
Reviewed-by: Tom Rini <trini@konsulko.com>

include/configs/ti_armv7_common.h

@@ -231,9 +231,7 @@
 #define CONFIG_SPL_EXT_SUPPORT
 #endif
 
-#ifdef CONFIG_SPL_BUILD
-#define CONFIG_SYS_THUMB_BUILD	/* Thumbs mode to save space in SPL */
-#endif
+#define CONFIG_SYS_THUMB_BUILD
 
 /* General parts of the framework, required. */
 #define CONFIG_SPL_I2C_SUPPORT