ARM: 8310/1: l2c: Fix prefetch settings dt parsing

Allow prefetch settings overriding by device tree, in case
l2x0_cache_size_of_parse() returns value, prefetch tuning
properties are silently ignored. E.g. arm,double-linefill* and
arm,prefetch*.
This happens for example, when "cache-size" or "cache-sets"
properties haven't been filled in l2c dt node.

Comments from Fabrice Gasnier:

 Allow device tree to override the L2C prefetch settings, even when
 l2x0_cache_size_of_parse() fails to parse the cache geometry due to (eg)
 missing "cache-size" or "cache-sets" properties.
Signed-off-by: Fabrice Gasnier <fabrice.gasnier@st.com>
Reviewed-by: Tomasz Figa <tomasz.figa@gmail.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

arch/arm/mm/cache-l2x0.c

@@ -1131,9 +1131,7 @@ static void __init l2c310_of_parse(const struct device_node *np,
 	}
 
 	ret = l2x0_cache_size_of_parse(np, aux_val, aux_mask, &assoc, SZ_512K);
-	if (ret)
-		return;
-
+	if (!ret) {
 		switch (assoc) {
 		case 16:
 			*aux_val &= ~L2X0_AUX_CTRL_ASSOC_MASK;
@@ -1149,6 +1147,7 @@ static void __init l2c310_of_parse(const struct device_node *np,
 			       assoc);
 			break;
 		}
+	}
 
 	prefetch = l2x0_saved_regs.prefetch_ctrl;