ARM: dra7xx: Change DPLL_PER_HS13 divider value

According to AM572x DM SPRS953A, QSPI bus speed can be 76.8MHz, hence
update QSPI input clock divider value (DPLL_PER_HS13) to provide 76.8MHz
clock, so that driver can use the same.

Signed-off-by: Vignesh R <vigneshr@ti.com>
Reviewed-by: Tom Rini <trini@konsulko.com>
Reviewed-by: Mugunthan V N <mugunthanvnm@ti.com>
Reviewed-by: Jagan Teki <jteki@openedev.com>

arch/arm/cpu/armv7/omap5/hw_data.c

@@ -160,7 +160,7 @@ static const struct dpll_params per_dpll_params_768mhz_es2[NUM_SYS_CLKS] = {
 
 static const struct dpll_params per_dpll_params_768mhz_dra7xx[NUM_SYS_CLKS] = {
 	{32, 0, 4, 1, 3, 4, 4, 2, -1, -1, -1, -1},		/* 12 MHz   */
-	{96, 4, 4, 1, 3, 4, 4, 2, -1, -1, -1, -1},		/* 20 MHz   */
+	{96, 4, 4, 1, 3, 4, 10, 2, -1, -1, -1, -1},		/* 20 MHz   */
 	{160, 6, 4, 1, 3, 4, 4, 2, -1, -1, -1, -1},		/* 16.8 MHz */
 	{20, 0, 4, 1, 3, 4, 4, 2, -1, -1, -1, -1},		/* 19.2 MHz */
 	{192, 12, 4, 1, 3, 4, 4, 2, -1, -1, -1, -1},		/* 26 MHz   */