test: syslog: Add missing include of <env.h>

These files was making environment calls without including <env.h> and so
relying on an indirect inclusion from elsewhere. Add the missing include
directly.

Signed-off-by: Tom Rini <trini@konsulko.com>

test/log/syslog_test.c

@@ -10,6 +10,7 @@
 /* Override CONFIG_LOG_MAX_LEVEL */
 #define LOG_DEBUG
 
+#include <env.h>
 #include <asm/global_data.h>
 #include <dm/device.h>
 #include <hexdump.h>

test/log/syslog_test_ndebug.c

@@ -7,6 +7,7 @@
  * Invoke the test with: ./u-boot -d arch/sandbox/dts/test.dtb
  */
 
+#include <env.h>
 #include <asm/global_data.h>
 #include <dm/device.h>
 #include <hexdump.h>