locking/local_lock: s/l/__l/ and s/tl/__tl/ to reduce the risk of shadowing

The Linux kernel coding style advises to avoid common variable
names in function-like macros to reduce the risk of namespace
collisions.

Throughout local_lock_internal.h, several macros use the rather common
variable names 'l' and 'tl'. This already resulted in an actual
collision: the __local_lock_acquire() function like macro is currently
shadowing the parameter 'l' of the:

  class_##_name##_t class_##_name##_constructor(_type *l)

function factory from <linux/cleanup.h>.

Rename the variable 'l' to '__l' and the variable 'tl' to '__tl'
throughout the file to fix the current namespace collision and
to prevent future ones.

[ bigeasy: Rebase, update all l and tl instances in macros ]

Signed-off-by: Vincent Mailhol <mailhol@kernel.org>
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Acked-by: Waiman Long <longman@redhat.com>
Link: https://patch.msgid.link/20251127144140.215722-3-bigeasy@linutronix.de

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