zephyr: alloc: add 32K virtual heap bucket

The original virtual heap layout used the full 0x100000 region and forced
24 KB DMA buffers to consume 64 KB blocks.
Increase the virtual heap region size to 0x140000 and add a 32 KB block
pool so medium-sized DMA buffers no longer deplete the 64 KB entries.

Signed-off-by: Adrian Bonislawski <adrian.bonislawski@intel.com>

Author: abonislawski

zephyr/Kconfig

@@ -93,7 +93,7 @@ config SOF_ZEPHYR_VIRTUAL_HEAP_SIZE
 config SOF_ZEPHYR_VIRTUAL_HEAP_REGION_SIZE
 	hex "Size in bytes of virtual memory region for virtual heap shared for all cores"
 	depends on MM_DRV_INTEL_ADSP_MTL_TLB
-	default 0x100000
+	default 0x140000
 	help
 	  This config defines size of virtual heap region shared between all cores
 

zephyr/lib/alloc.c

@@ -344,6 +344,7 @@ static const struct vmh_heap_config static_hp_buffers = {
 		{ 2048, 8},
 		{ 4096, 11},
 		{ 8192, 10},
+		{ 32768, 8},
 		{ 65536, 3},
 		{ 131072, 1},
 		{ 524288, 1} /* buffer for kpb */