[sw/dif/otbn] Fix missing dependency

Signed-off-by: Srikrishna Iyer <sriyer@google.com>
diff --git a/sw/device/lib/dif/meson.build b/sw/device/lib/dif/meson.build
index b21220b..be25c09 100644
--- a/sw/device/lib/dif/meson.build
+++ b/sw/device/lib/dif/meson.build
@@ -402,6 +402,7 @@
     ],
     dependencies: [
       sw_lib_mmio,
+      sw_lib_dif_autogen_otbn,
     ],
   )
 )
@@ -423,7 +424,7 @@
     c_args: ['-DMOCK_MMIO'],
     cpp_args: ['-DMOCK_MMIO'],
   ),
-  suite: 'dif',  
+  suite: 'dif',
 )
 
 # Reset Manager DIF library (dif_rstmgr)
@@ -672,7 +673,7 @@
     c_args: ['-DMOCK_MMIO'],
     cpp_args: ['-DMOCK_MMIO'],
   ),
-  suite: 'dif',  
+  suite: 'dif',
 )
 
 # Entropy Source