soc: qcom: l2_reuse: update the name of the sysfs node

Update the name of the sysfs node to extended_cache_enable
for proper readability.

Change-Id: I11e16d7df72e863547dc6880b64a94fbca1c7413
Signed-off-by: Raghavendra Kakarla <rkakarla@codeaurora.org>