ISDIMM - compile fix

  Add the isdimm cpp file to vpd-manager meson
  Fix namespace for isdimm

Change-Id: I2620dc51f5674b9261aa95720def235b24b97ed2
Signed-off-by: jinuthomas <jinu.joy.thomas@in.ibm.com>
diff --git a/vpd-manager/meson.build b/vpd-manager/meson.build
index 74bc567..574629e 100644
--- a/vpd-manager/meson.build
+++ b/vpd-manager/meson.build
@@ -16,6 +16,7 @@
                       '../common_utility.cpp',
                       '../vpd-parser//keyword_vpd_parser.cpp',
                       '../vpd-parser/memory_vpd_parser.cpp',
+                      '../vpd-parser/isdimm_vpd_parser.cpp',
                       '../vpd-parser/parser_factory.cpp'
                      ]