[source] ath25: add missed HAVE_IRQ_EXIT_ON_IRQ_STACK

[LEDE Commits]

nbd pushed a commit to source.git, branch master:
https://git.lede-project.org/6a3d82a3fabb4cae6a9baa29ed60b65501a4f01d

commit 6a3d82a3fabb4cae6a9baa29ed60b65501a4f01d
Author: Sergey Ryazanov <ryazanov.s.a at gmail.com>
AuthorDate: Wed May 31 00:46:39 2017 +0300

    ath25: add missed HAVE_IRQ_EXIT_ON_IRQ_STACK
    
    Add HAVE_IRQ_EXIT_ON_IRQ_STACK kernel configuration symbol that was
    missed during backporting separate IRQ stack for MIPS from upstream.
    
    Signed-off-by: Sergey Ryazanov <ryazanov.s.a at gmail.com>
---
 target/linux/ath25/config-4.9 | 1 +
 1 file changed, 1 insertion(+)

diff --git a/target/linux/ath25/config-4.9 b/target/linux/ath25/config-4.9
index de771de..aae77a4 100644
--- a/target/linux/ath25/config-4.9
+++ b/target/linux/ath25/config-4.9
@@ -79,6 +79,7 @@ CONFIG_HAVE_FUNCTION_GRAPH_TRACER=y
 CONFIG_HAVE_FUNCTION_TRACER=y
 CONFIG_HAVE_GENERIC_DMA_COHERENT=y
 CONFIG_HAVE_IDE=y
+CONFIG_HAVE_IRQ_EXIT_ON_IRQ_STACK=y
 CONFIG_HAVE_IRQ_TIME_ACCOUNTING=y
 CONFIG_HAVE_LATENCYTOP_SUPPORT=y
 CONFIG_HAVE_MEMBLOCK=y