mm/cma: make MAX_CMA_AREAS = CONFIG_CMA_AREAS

mm/cma: make MAX_CMA_AREAS = CONFIG_CMA_AREAS

There is no real difference between the global area, and other
additionally configured CMA areas via CONFIG_CMA_AREAS that always
defaults without user input.  This makes MAX_CMA_AREAS same as
CONFIG_CMA_AREAS, also incrementing its default values, thus maintaining
current default for MAX_CMA_AREAS both for UMA and NUMA systems.

Link: https://lkml.kernel.org/r/20240205051929.298559-1-anshuman.khandual@arm.com
Signed-off-by: Anshuman Khandual <anshuman.khandual@arm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>