tx53: remove reset() when not doing lowlevel init.
This patch fixes a linker error when PBL_IMAGE=n and DO_LOW_LEVEL_INIT=n.
In this configuration the symbol reset() was present multiple times,
and prevented the barebox image to be linked.
Signed-off-by: Christian Kapeller <christian.kapeller@cmotion.eu>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>