src/soc: Remove unused <stdlib.h>

Found using:
diff <(git grep -l '#include <stdlib.h>' -- src/) <(git grep -l 'memalign(\|malloc(\|calloc(\|free(' -- src/)

Change-Id: I08e1a680de9bfcc7d74e88a15abe9eef327b4961
Signed-off-by: Elyes HAOUAS <ehaouas@noos.fr>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/60617
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Jonathan Zhang <jonzhang@fb.com>

src/soc/amd/common/block/acpi/ivrs.c

@@ -15,7 +15,6 @@
 #include <soc/acpi.h>
 #include <soc/data_fabric.h>
 #include <soc/pci_devs.h>
-#include <stdlib.h>
 
 #define MAX_DEV_ID 0xFFFF
 

src/soc/amd/picasso/agesa_acpi.c

@@ -18,7 +18,6 @@
 #include <amdblocks/ioapic.h>
 #include <soc/data_fabric.h>
 #include <soc/pci_devs.h>
-#include <stdlib.h>
 #include <arch/mmio.h>
 
 static unsigned long gen_crat_hsa_entry(struct acpi_crat_header *crat, unsigned long current)

src/soc/intel/common/block/tcss/tcss.c

@@ -11,7 +11,6 @@
 #include <soc/pci_devs.h>
 #include <soc/pcr_ids.h>
 #include <soc/tcss.h>
-#include <stdlib.h>
 #include <drivers/intel/pmc_mux/conn/chip.h>
 
 #define BIAS_CTRL_VW_INDEX_SHIFT		16

src/soc/intel/xeon_sp/cpx/soc_util.c

@@ -8,7 +8,6 @@
 #include <soc/pci_devs.h>
 #include <soc/soc_util.h>
 #include <soc/util.h>
-#include <stdlib.h>
 
 const struct SystemMemoryMapHob *get_system_memory_map(void)
 {