testcase/le_tc/kernel: Add config flag for timer tc to resolve asserts
testcase/le_tc/kernel: Add config flag for timer tc to resolve asserts

Timer make direct calls to kernel specific structures
which results in assert.

So this patch adds protected build config dependency for above mentioned
kernel testcase.

Signed-off-by: Nilabh <726d9c699f893ba09f8631e19b4a28928f6b3501@partner.samsung.com>

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