ptl: reduce the size of the shared buffer on ACE 3.0

CI nocodec tests on PTL are running out of memory since shared
memory has been introduced. Since it isn't widely used yet, reduce
its default size on ACE 3.0.

Signed-off-by: Guennadi Liakhovetski <guennadi.liakhovetski@linux.intel.com>

Author: lyakh

zephyr/Kconfig

@@ -61,7 +61,7 @@ config SOF_ZEPHYR_SHARED_BUFFER_HEAP_SIZE
 	hex "Size of the shared buffer heap for SOF userspace modules"
 	default 0x0 if !SOF_USERSPACE_USE_SHARED_HEAP
 	default 0x1E000 if SOC_INTEL_ACE15_MTPM || SOC_INTEL_ACE20_LNL
-	default 0x1A000 if SOC_INTEL_ACE30
+	default 0x10000 if SOC_INTEL_ACE30
 	default 0x0
 	depends on USERSPACE
 	help