ARM: at91: fix clock conid for atmel_tcb.1 on 9260/9g20

The conid is supposed to be t0/t1/t2_clk.

Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
Acked-by: Nicolas Ferre <nicolas.ferre@atmel.com>
Cc: stable <stable@vger.kernel.org>