NVMe: adding NVMeCache and NVMeMetricStore to plugin headers

The headers are required by the NVMed plugins.

Tested: Bitbake compiles
Signed-off-by: Hao Jiang <jianghao@google.com>
Change-Id: I2fed6362620719b83b2b1bf562e78ff7e097a42c

src/meson.build

diff --git a/src/meson.build b/src/meson.build
index 8ebfe78..b7046fc 100644
--- a/src/meson.build
+++ b/src/meson.build
@@ -271,6 +271,8 @@
         'Thresholds.hpp',
         'sensor.hpp',
         'NVMeSensor.hpp',
+        'NVMeCache.hpp',
+        'NVMeMetricStore.hpp',
         subdir: 'nvmed'
     )