bmc-vmi-ca: Fix executable name

The executable name expected by the bmc-vmi-ca-manager.service file is
bmc-vmi-ca, but when the repo was updated to use meson, the file name
was mistakenly set to bmc_vmi_ca.

Tested: Verified the service started successfully in p10bmc:
```
root@p10bmc:~# systemctl status bmc-vmi-ca-manager
* bmc-vmi-ca-manager.service - BMC VMI CA authority manager
     Loaded: loaded
(8;;file://p10bmc/lib/systemd/system/bmc-vmi-ca-manager.service/lib/systemd/system/bmc-vmi-ca-manager.service8;;;
enabled; preset: enabled)
     Active: active (running) since Thu 2022-12-01 20:45:46 UTC; 1min
44s ago
   Main PID: 236 (bmc-vmi-ca)
        CPU: 6ms
     CGroup: /system.slice/bmc-vmi-ca-manager.service
             `-236 /usr/bin/bmc-vmi-ca

Dec 01 20:45:45 p10bmc systemd[1]: Starting BMC VMI CA authority
manager...
Dec 01 20:45:46 p10bmc systemd[1]: Started BMC VMI CA authority manager.
```

Change-Id: Id32c79a470255e6818d46e27cab82e17fc10c4f4
Signed-off-by: Adriana Kobylak <anoo@us.ibm.com>
diff --git a/bmc-vmi-ca/meson.build b/bmc-vmi-ca/meson.build
index bf69205..8871008 100644
--- a/bmc-vmi-ca/meson.build
+++ b/bmc-vmi-ca/meson.build
@@ -20,7 +20,7 @@
 )
 
 executable(
-    'bmc_vmi_ca',
+    'bmc-vmi-ca',
     'mainapp.cpp',
     include_directories: '..',
     dependencies: bmc_vmi_ca_dep,