avb: Make AVB independent of fastboot

AVB only uses CONFIG_FASTBOOT_BUF_ADDR from fastboot for memory.
This memory is used for assigning temporary buffers.
This can be assigned a new variable and used as CONFIG_AVB_BUF_ADDR.
This is to support future boards that support AVB but dont support
USB and therefore dont support FASTBOOT.

Signed-off-by: Usama Arif <usama.arif@arm.com>
Cc: Igor Opaniuk <igor.opaniuk@gmail.com>
Reviewed-by: Tom Rini <trini@konsulko.com>
Acked-by: Igor Opaniuk <igor.opaniuk@gmail.com>
[trini: Change defaults]
Signed-off-by: Tom Rini <trini@konsulko.com>
diff --git a/include/avb_verify.h b/include/avb_verify.h
index a8d7090..1e787ba 100644
--- a/include/avb_verify.h
+++ b/include/avb_verify.h
@@ -72,12 +72,12 @@
 
 static inline size_t get_sector_buf_size(void)
 {
-	return (size_t)CONFIG_FASTBOOT_BUF_SIZE;
+	return (size_t)CONFIG_AVB_BUF_SIZE;
 }
 
 static inline void *get_sector_buf(void)
 {
-	return map_sysmem(CONFIG_FASTBOOT_BUF_ADDR, CONFIG_FASTBOOT_BUF_SIZE);
+	return map_sysmem(CONFIG_AVB_BUF_ADDR, CONFIG_AVB_BUF_SIZE);
 }
 
 static inline bool is_buf_unaligned(void *buffer)