arm64: Increase kernel stack size to 32K

To work around stack overflow with the drm/asahi driver plus zram
swap-out, TBD if we can refactor things enough to bring it under 16K
again...

Signed-off-by: Asahi Lina <lina@asahilina.net>

Author: hoshinolina

arch/arm64/include/asm/memory.h

@@ -112,7 +112,7 @@
 
 #define DIRECT_MAP_PHYSMEM_END	__pa(PAGE_END - 1)
 
-#define MIN_THREAD_SHIFT	(14 + KASAN_THREAD_SHIFT)
+#define MIN_THREAD_SHIFT	(15 + KASAN_THREAD_SHIFT)
 
 /*
  * VMAP'd stacks are allocated at page granularity, so we must ensure that such