ref(mem): change hyp mem management to cope with non-unified plats

Refactored slightly the root pool bitmap base to improve clarity of code
Removed the passing of load_addr as argument since it can be defined as
a global variable in each arch boot file.

Signed-off-by: Daniel Oliveira <[email protected]>

Author: danielRep

src/arch/armv8/aarch32/boot.S

@@ -23,6 +23,10 @@
  */
 _barrier: .4byte 0
 
+.balign 4
+.global img_addr
+img_addr: .4byte 0
+
 /**
  *  The following code MUST be at the base of the image, as this is bao's entry point. Therefore
  * .boot section must also be the first in the linker script. DO NOT implement any code before the

src/arch/armv8/aarch64/boot.S

@@ -17,6 +17,10 @@
  .global _boot_barrier
 _boot_barrier: .8byte 0
 
+.balign 8
+.global img_addr
+img_addr: .8byte 0
+
 /**
  * The following code MUST be at the base of the image, as this is bao's entry point. Therefore
  * .boot section must also be the first in the linker script. DO NOT implement any code before the

src/arch/riscv/boot.S

@@ -71,6 +71,10 @@ _extra_allocated_phys_mem_sym: .8byte extra_allocated_phys_mem
  */
 _barrier: .8byte 0		
 
+.balign 4
+.global img_addr
+img_addr: .8byte 0
+
 /**
  * 	The following code MUST be at the base of the image, as this is bao's entrypoint. Therefore
  * .boot section must also be the first in the linker script. DO NOT implement any code before the