lib: sbi: Introduce domain data

Different parts of OpenSBI require their own per-domain data so
introduce domain data (or sbi_domain_data) which can be registered
by any part of OpenSBI. Using the domain data, the domain framework
will create a data pointer for every domain which can be used to
maintain some per-domain state.

Signed-off-by: Anup Patel <apatel@ventanamicro.com>
Reviewed-by: Yu Chien Peter Lin <peterlin@andestech.com>

lib/sbi/objects.mk

@@ -65,6 +65,7 @@ libsbi-objs-y += sbi_bitmap.o
 libsbi-objs-y += sbi_bitops.o
 libsbi-objs-y += sbi_console.o
 libsbi-objs-y += sbi_domain_context.o
+libsbi-objs-y += sbi_domain_data.o
 libsbi-objs-y += sbi_domain.o
 libsbi-objs-y += sbi_emulate_csr.o
 libsbi-objs-y += sbi_fifo.o