timer: Fix alarm stop when stopped from alarm's callback
This patch adds a flag to indicate whether an alarm is
started or not. This allows the timer to be correctly
stopped within the callback isr.
Change-Id: Ib1be29f852799604446422d7bc7b99c9afcc67c1
Signed-off-by:
Nicola Mazzucato <nicola.mazzucato@arm.com>
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